Best Picture winner set in Iran (4)
I believe the answer is:
argo
'best picture winner set in iran' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for argo that I've seen before include "Old craft" , "Ship Jason sailed to find the Golden Fleece" , "Old sailing vessel" , "Jason's boat" , "Ancient ship" .)